I know this is a little bit off topic, but to answer your first questions.

You want to bake bread? Well start a little speciality bakery.
There is a lot of profit in selling bread. The trouble is selling it.
If you want to sell it in the store... I hope you know someone.
I doubt most stores would even work with a new supplier.
And if they do, be prepared to pay for the shelf space.
--Its a big club, and you aren't in it.

For another example, how much does a toaster cost?
Well, at Wallymart, it costs $19.99. At a fancy store $199.99.
How much does it cost to produce? About $2 to $13.
There is very little material difference and almost no labor difference between the low end and high end toaster.
Things are priced at what the consumer thinks is the correct price.

The market is just so hard to enter, you might as well not try.
If you want to sell actual things, you will need to build the entire vertical. From just after raw materials all the way to customer satisfaction.